Test Step 3. Check the Sensor In The Engine

117

TM 9-2320-312-24-2

Troubleshooting Section

Refer to Troubleshooting, "Troubleshooting without

D. Check the harness and wiring for abrasion and

a Diagnostic Code" for a procedure that best

pinch points from the appropriate sensor back

describes the conditions.

to the ECM.

STOP.

Expected Result:

No Proceed to Test Step 4.

All connectors, pins and sockets should be

completely coupled and/or inserted and the harness

Test Step 4. Compare The Temperature

and wiring should be free of corrosion, abrasion

Reading To The Temperature From

or pinch points.

Another Gauge.

Choose the OK option in order to select the sensor

that requires troubleshooting or select the NOT OK

A. Remove the temperature sensor from the engine.

option if the wiring is causing the problem.

B. Connect the sensor to the engine harness. Hold

Results:

the sensor and the thermocouple probe from the

6V-9130 Temperature Adapter in the air. Allow

OK Proceed to Test Step 3.

three minutes for the sensor and the probe to

respond to the temperature of the air.

Not OK Repair the connectors or wiring and/or

replace the connectors or wiring. Ensure that all

C. The ET status screen will display the temperature

of the seals are properly in place and ensure that

reading from the sensor. Compare the

the connectors are completely coupled. Verify

temperature reading to the temperature reading

that the repair eliminates the problem. STOP.

from the 6V-9130 Temperature Adapter.

Test Step 3. Check the Sensor In The

D. Hold the sensor and the thermocouple probe in

Engine.

your hand and check the temperatures again.

Do not expose the sensor to a flame.

A. Ensure that the temperature of the engine is cool

before starting this procedure.

Expected Result:

B. Connect ET to the cab data link connector.

The two measurements are within 15 C (27 F) of

each other.

C. Turn the ignition key switch to the ON position.

Note: Do not expect the sensor and the

D. Note the temperature for the sensor on the ET

thermocouple probe from the 6V-9130 Temperature

status screen.

Adapter to respond to the temperature change at

the same rate.

E. Start the engine but remain parked.

Results:

F. Monitor the temperature for the sensor on the ET

status screen as the engine is warming.

Yes The sensor is functioning correctly. If

a problem is still suspected the problem is a

Expected Result:

mechanical problem. The problem is not an

electronic problem.

The temperature before starting the engine should

be within reasonable limits, and the temperature

Repair: Perform the following diagnostic

increases as the engine warms.

procedure:

Note: The engine may require several hours to cool

Refer to Troubleshooting, "Troubleshooting without

down depending on the ambient air temperature

a Diagnostic Code" for a procedure that best

around the vehicle.

describes the conditions.

Results:

STOP.

Yes The sensor is functioning correctly. If

a problem is still suspected the problem is a

mechanical problem. The problem is not an

Repair: Perform the following diagnostic

electronic problem.

procedure:

Repair: Perform the following diagnostic

1. Temporarily install another sensor.

procedure:

2. Repeat this test step.